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Add transforms feature

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This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
This commit is contained in:
Peter Eisentraut
2015-04-26 10:33:14 -04:00
parent f320cbb615
commit cac7658205
101 changed files with 6034 additions and 2811 deletions
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18
doc/src/sgml/ref/create_function.sgml
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@ -25,6 +25,7 @@ CREATE [ OR REPLACE ] FUNCTION
[ RETURNS <replaceable class="parameter">rettype</replaceable>
| RETURNS TABLE ( <replaceable class="parameter">column_name</replaceable> <replaceable class="parameter">column_type</replaceable> [, ...] ) ]
{ LANGUAGE <replaceable class="parameter">lang_name</replaceable>
| TRANSFORM { FOR TYPE <replaceable class="parameter">type_name</replaceable> } [, ... ]
| WINDOW
| IMMUTABLE | STABLE | VOLATILE | [ NOT ] LEAKPROOF
| CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT
@ -260,6 +261,23 @@ CREATE [ OR REPLACE ] FUNCTION
</listitem>
</varlistentry>
<varlistentry>
<term><literal>TRANSFORM { FOR TYPE <replaceable class="parameter">type_name</replaceable> } [, ... ] }</literal></term>
<listitem>
<para>
Lists which transforms a call to the function should apply. Transforms
convert between SQL types and language-specific data types;
see <xref linkend="sql-createtransform">. Procedural language
implementations usually have hardcoded knowledge of the built-in types,
so those don't need to be listed here. If a procedural language
implementation does not know how to handle a type and no transform is
supplied, it will fall back to a default behavior for converting data
types, but this depends on the implementation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>WINDOW</literal></term>